Medicare Denied: No Prior Authorization (Your Fix)

What This Means

Your claim was denied because the service required prior authorization (advance approval) from your health plan, and that approval wasn’t obtained before the service was provided. This is one of the most common reasons for Medicare Advantage claim denials.

This denial doesn’t mean the service wasn’t needed. It means the required administrative step of getting the plan’s approval in advance was missed.

Why This Happens

• Your provider didn’t request prior authorization. Some services require advance approval from your plan. If your provider didn’t submit the request before providing the service, the claim can be denied.
• The authorization request was incomplete or never processed. Your provider may have started the authorization process but didn’t complete it, or the request was lost in the system.
• The authorization number wasn’t included on the claim. The provider obtained authorization but didn’t put the authorization number on the claim form when billing.
• The service was provided on an emergency basis. Emergency services generally don’t require prior authorization, but follow-up care or non-emergency services provided during the same visit might.
• You’re in a Medicare Advantage plan. MA plans require prior authorization far more often than Original Medicare. In 2024, Medicare Advantage insurers made nearly 53 million prior authorization determinations, according to KFF.

Should You Appeal?

What To Do Next

1. Contact your provider’s office immediately. Ask them if they can request retroactive authorization from your plan. Some plans allow this, especially for urgent situations, and it can resolve the denial without a formal appeal.
2. Check whether the authorization was actually obtained. It’s possible your provider got the authorization but forgot to include the number on the claim. Ask the billing office to verify and resubmit if needed.
3. If retroactive authorization isn’t possible, file an appeal. Follow the instructions on your denial notice. Ask your provider to include a letter explaining why the service was medically necessary.
4. Keep records of everything. Save your denial notice, any correspondence with your provider or plan, and notes from phone calls (including dates, names, and what was discussed).
5. For Medicare Advantage plans, know that standard appeals must be decided within 30 days. You can request an expedited appeal (decided within 72 hours) if waiting could seriously harm your health.

Sources

• KFF: Medicare Advantage Insurers Made Nearly 53 Million Prior Authorization Determinations in 2024
• OIG: Some Medicare Advantage Organization Denials of Prior Authorization Requests Raise Concerns About Beneficiary Access to Medically Necessary Care (2022)
• Medicare.gov: Filing an Appeal
• Center for Medicare Advocacy: Medicare Prior Authorization

Frequently Asked Questions